steward



2 Sheets-Sheet 1.

(No Model.)

G. R. STEWARD. PURNAGE DOOR.

Patent'ed May 17,1898.

lIHHHHFNIPUIHWLIHMHHHUHHHHNHH HUUHHII IIIHHHI 2 Sheets- Sheet 2.

(No Model.)

G. R. STEWARD.

FURNACB DOOR.

'Patawa May 17, 1898.

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IlNrrnn STATES PATENT Orricn.

GEORGE R. STEWARD, OF LONDON, ENGLAND, ASSIGNOR OF TWO-TI'IIRDS TO EDWINEAGLING GLASKIN, OF SAME PLACE, AND JOSEPH CASH, OF

COVENTRY, ENGLAND.

FU RNACE-DOOR.

SPECIFICATION forming part of Letters Patent No. 604,093, dated May 17,1898.

Application filed .Tune 24, 1 8 9 '7.

To all whom, it may concern:

Be it known that I, GEORGE RICHARD STEW- ARD, of 15 Queen street, in thecity of London, England, have invented certain new and usefulImprovementsA in the Construction of Furnace-Doors, of which thefollowing is a specification.

The object of this invention is to produce, as far as possible, asmokeless furnace, at-

o tempts to secure which have been frequently made and with varyingresults. To attain this object, I introduce, through the furnacedoor,air in such a manner that it becomes heated before it commingles withthe smoke and gases distilled from the incandescent fuel of the furnace,and such commingling is efiected so as to insure a more completecombustion than heretofore of the smoke and gases evolved.

I am aware that many inventions have admitted air to the furnace throughthe firedoor and that the air so admitted has been deflected in variousways; but the means which I employfor insuring the heating and z 5commingling of the air with the gases of combustion is` of such acharacter as will cause it to produce whirling streams of heated. airthat will act more or less independently of each 'other when firstmeeting with the gases of combustion, and thereby insure a more perfectcommingling ofthe admitted air with the generated vapors of the furnacethan has heretofore been efiected.

In the accompanying drawings, Figure l 3 5 shows in elevation the innerface of the furhace-door fitted according` to my invention. Fig. 2 is asectional plan view taken in the line l 2 of Fig. 1, and Fig. 3 is avertical section taken in the line 3 4 of Fig. 1 in the di- 40 rectionof the arrow.

The furnace-door A 4is formed with longitudinal vertical openings a ct*.(Shown in dots at Fig. l and more clearly in the section Fig. 2.) Theseopenings are covered by a metal box B on the front of the door, havingopenings in its' front and in .all its sides to leave free ingress forthe air, which will absorb heat from contact with the metal of the doorbefore entering the furnace through the openings a ct*. Of theseopenings there are Serial No. 642,076. (No model.)

two pairs, and each opening is covered with a hollow metallic projectionor air-trunk, (marked, respectively, b b*,) which severally form acurved air-passage about equal in breadth to the length of the openingwhich it covers. These curved air-passages are arranged in pairs withthe curves turned inward, so that the vents of each pair of curvedpassages are opposed to each other, but in different planes. The form ofthese projections or trunks will consequently be such that the curvedpassages b* b* Will have a radius greater than the curved passages b b.The object of this arrangement is to deliver into the furnace currentsof air from the passages b* b*, that will overlap (so to speak) thecurrents of air issuing from the passages b b. By thus admitting Streamsof air through the fire-door which are heated, as before eX- plained, Ieifect the desired commingling of the air with the gases of combustion,the air thus admitted by its whirling action efiectually sucking up, asinto a vortex, the ascending gases on their passage to thefurnacebridge.

The fire-door may have other openings for the admission of air below thecurved guides, as shown at c c. These openings I cover by deflectors c'c', set at different angles to the door-face, as shown at Fig. 3, theaction of which is to cause the two streams of air admitted to impingethe one upon the other and direct a whirling stream toward thedead-plate, which deflects it toward the fire without interfering withthe whirling action set up in the main supply.

Figs. 4 and 5 illustrate a modification of the means which I employ forproducing the whirling effect above mentioned. Fig. 4 is a view of theinner face of the door; and Fig. 5, a vertical section ofthe same, takenon the line 5 6 of Fig. 4. In this case the openings in the door coveredby the hollow metallic projections forming the curved passages arehorizontal in place of vertical openings. There is but one pair ofhollow curved projections b b*, and they are situate over'the middle ofthe door and extend nearly from side to side thereof. In thismodification the like provision is made for causing the Streams IOO ofair which pass out from the curved passages to overlap the one the otheras they enter the furnace, and thus produce the whirling action that isfound necessary to effect the intimate min gling of the air with thegases evolved from the fuel. Openings c c, provided with defiectors c',are made in this door, as in that shown' at Fig. 1, for the purpose ofsetting up a whirling action in the air admitted to the lower part ofthe fire-chamber.

What I claim is- 1. The combination with a furnace-door, having a pairor pairs of slits or openings, of curved air-trunks projecting into thefurnace, and forming air-passages, the vents of each pair of which areopposed to each other, but situate in different planes, as and for thepurpose set forth.

2. The combination with a furnace-door' having slits or openings coveredby curved air-trunks projecting inward, and arranged in pairs, withvents opposed to each other, but in different planes, of a metal box onthe front of the door covering the slits, and having openings in itsfront, and in all its sides, as and for the purpose set forth.

3. The combination with a furnace-door having slits or openings coveredby curved air-trunks arranged in pairs, with vents opposed to eachother, but in different planes, and a perforated ,metal box on the frontof the door, covering the slits of other openings for the admission ofair below the curved trunks and metal box, and having deflectors set atdifferent angles to the door-face, as and for the purpose set forth.

4:. The combination, in a furnace-door, of slits or openings covered bycurved air-trunks arranged in pairs with vents opposed to each other,but in different planes, of other airopenings, below the curved trunks,and covered by deflectors set at different angles to the door-face, asand for the purpose set forth.

5. The combination with the dead-plate of a furnace, of a furnace-doorhaving longitudinal openings near its lower edge each provided at itsupper side with a defiector, said deflectors being set at differentangles to the door-face, whereby a whirling stream of air is directedtoward the dead-plate, and, by it, deflected toward the fire, as setforth.

London, England, May 31, 1897.

GEORGE R. STEWARD.

Witnesses:

H. K. WHITE, GEO. J. B. FRANKLIN.

